At a local manufacturing plant, employees must complete new machine set ups within 30 minutes. New machine setup times can be described by a normal model with a mean of 22 minutes and a standard deviation of four minutes.
a. What percent of new machine set ups take more than 30 minutes?
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2 answers

Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score. 👍
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answered by PsyDAG 
2.28%
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answered by beth
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